But he lost 23 times against you.
's right. We have to also throw into the mix. But I do not think it is currently the decisive factor. But he has achieved in my opinion too much. Maybe this is crucial if I move him even closer after major victories. But 14 or 17 Grand Slam titles is a significant difference. At the present time there is no question that he must be the greater player than me.

stay away from injury obviously. apart from that i feel his game could benefit from better movement, maybe it is just me but he looks bulkier since after his injury. i don't think losing a few pounds will diminish his power too much.

More time to fully recover his game and confidence. He also needs a Plan B if Plan A of hitting the ball hard down the middle isn't working. His lack of a Plan B is his biggest issue. Movement can improve but he'll never be a super quick guy, he doesn't have the same first step explosion. It's something he'll have to adjust to.

His movement is fine. With the kind of power he has, he doesn't need to be able to run down every ball like Murray or Ferrer. His movement is very good for a guy his size and with his power.

The keys are no more injuries obviously, and a better serve: he doesn't get enough free points on serve against top players, it's a ridiculously weak shot for a guy his size. If his serve becomes more dominant, the rest will follow.

He should also hit his backhand down the line more often, he seems to hit it crosscourt all the time, it's become a bit predictable.

Oh yeah, and becoming a bit more comfortable at the net wouldn't hurt either, but net game isn't that important in today's game.